ENABLE Reference Manual

ENABLE FUNCTION KEYS
Multifile UPDATE Operations
Undo (SF13) Operations
You can undo a file operation (DELETE, DELETE BOX, INSERT, INSERT
BOX, UPDATE, or UPDATE BOX) by requesting an UNDO operation.
To undo a DELETE opertion, the application must insert the
deleted record. The application can undo a DELETE operation if
another file operation has not intervened between the DELETE
operation and the UNDO request.
To undo an UPDATE operation, the application must replace the old
record. The application can undo an UPDATE operation if:
• Another file operation has not intervened between the UPDATE
operation and the UNDO request
• The updated record has not been modified by another
application
To undo an INSERT operation, the application must delete the
inserted record. The application can undo an INSERT operation
if:
• Another file operation has not intervened between the INSERT
operation and the UNDO request
• The inserted record has not been modified by another
application
• The INSERT operation was not performed on an entry-sequenced
or unstructured file. (The application must delete the record
to undo the INSERT operation, but ENSCRIBE, the data base
record manager supplied by Tandem, does not allow DELETE
operations on entry-sequenced or unstructured files.)
Print Operations
You can print the current contents of the screen by requesting
two operations:
• DEFINE PRINTER
• PRINT
8-17